implements the file permissions report correctly and tests it.

src/Umbraco.Core/DictionaryExtensions.cs

@@ -15,6 +15,25 @@ namespace Umbraco.Core
 	///</summary>
 	internal static class DictionaryExtensions
 	{
+
+        /// <summary>
+        /// Method to Get a value by the key. If the key doesn't exist it will create a new TVal object for the key and return it.
+        /// </summary>
+        /// <typeparam name="TKey"></typeparam>
+        /// <typeparam name="TVal"></typeparam>
+        /// <param name="dict"></param>
+        /// <param name="key"></param>
+        /// <returns></returns>
+	    public static TVal GetOrCreate<TKey, TVal>(this IDictionary<TKey, TVal> dict, TKey key)
+            where TVal : class, new()
+	    {
+	        if (dict.ContainsKey(key) == false)
+	        {
+                dict.Add(key, new TVal());
+	        }
+            return dict[key];
+	    }
+
         /// <summary>
         /// Updates an item with the specified key with the specified value
         /// </summary>

src/Umbraco.Web.UI.Client/src/installer/steps/permissionsreport.html

@@ -0,0 +1,26 @@
+<div>
+    <h1>Your permission settings are not ready for umbraco</h1>
+    <p>        
+        In order to run umbraco, you'll need to update your permission settings.
+        Detailed information about the correct file & folder permissions for Umbraco can be found 
+        <a href="http://our.umbraco.org/documentation/Installation/permissions"><strong>here</strong></a>. 
+    </p>
+    <p>
+        The following report list the permissions that are currently failing. Once the permissions are fixed press the 'Go back' button to restart the installation.
+    </p>
+    
+    <ul class="permissions-report unstyled">
+        <li ng-repeat="(category, items) in installer.current.model.errors">
+            <h4>{{category}}</h4>
+            <ul>
+                <li ng-repeat="item in items">
+                    {{item}}
+                </li>
+            </ul>
+        </li>
+    </ul>
+    
+    <p>
+        <button class="btn btn-success" ng-click="restart()">Go back</button>
+   </p>
+</div>

src/Umbraco.Web.UI.Client/src/less/installer.less

@@ -57,6 +57,7 @@ body {
   height: 550px;
   text-align: left;
   padding: 30px;
+  overflow:hidden;
 }
 
 
@@ -222,3 +223,19 @@ height: 5px;
   right: 0;
   overflow: hidden;
 }
+
+.permissions-report {
+    overflow:auto;
+    height:320px;
+    margin:0;
+    display:block;
+    padding:0;
+}
+
+.permissions-report > li {
+    list-style:none;
+}
+
+.permissions-report h4 {
+    margin:7px;
+}

src/Umbraco.Web/Install/InstallSteps/FilePermissionsStep.cs

@@ -17,7 +17,7 @@ namespace Umbraco.Web.Install.InstallSteps
         {
             //first validate file permissions
             var permissionsOk = true;
-            var report = new List<string>();
+            var reportParts = new Dictionary<string, List<string>>();
 
             // Test default dir permissions
             foreach (var dir in FilePermissionHelper.PermissionDirs)
@@ -25,8 +25,9 @@ namespace Umbraco.Web.Install.InstallSteps
                 var result = SaveAndDeleteFile(IOHelper.MapPath(dir + "/configWizardPermissionTest.txt"));
                 if (!result)
                 {
+                    var report = reportParts.GetOrCreate("Folder creation failed");
                     permissionsOk = false;
-                    report.Add("Directory: ./" + dir);
+                    report.Add(dir);
                 }
             }
 
@@ -36,8 +37,9 @@ namespace Umbraco.Web.Install.InstallSteps
                 var result = OpenFileForWrite(IOHelper.MapPath(file));
                 if (!result)
                 {
+                    var report = reportParts.GetOrCreate("File writing failed");
                     permissionsOk = false;
-                    report.Add("File: " + file);
+                    report.Add(file);
                 }
             }
 
@@ -49,8 +51,9 @@ namespace Umbraco.Web.Install.InstallSteps
                     SaveAndDeleteFile(IOHelper.MapPath(dir + "/configWizardPermissionTest.txt"));
                 if (!result)
                 {
+                    var report = reportParts.GetOrCreate("File writing for packages failed");
                     permissionsOk = false;
-                    report.Add("Directory: " + dir);
+                    report.Add(dir);
                 }
             }
 
@@ -67,7 +70,8 @@ namespace Umbraco.Web.Install.InstallSteps
                 if (tempFile.Substring(0, 1) == "/")
                     tempFile = tempFile.Substring(1, tempFile.Length - 1);
 
-                report.Add(string.Format("File ./{0}. Error: {1}", tempFile, ee));
+                var report = reportParts.GetOrCreate("Cache file writing failed");
+                report.Add(tempFile);
             }
 
             // Test creation of folders
@@ -80,12 +84,14 @@ namespace Umbraco.Web.Install.InstallSteps
             catch
             {
                 permissionsOk = false;
-                report.Add("Folder creation failed");
+                var report = reportParts.GetOrCreate("Media folder creation failed");
+                report.Add("Could not create sub folders in " + SystemDirectories.Media);
             }
 
+
             if (permissionsOk == false)
             {
-                throw new InstallException("Permission check failed", "permissionsReport", new { errors = report });    
+                throw new InstallException("Permission check failed", "permissionsreport", new { errors = reportParts });    
             }
             
             return null;